Bursts of coherent synchrotron radiation at far-infrared and millimeter wavelengths have been observed at several storage rings. A microbunching instability has been proposed as the source for the bursts but the mechanism has yet to be elucidated. We provide the first evidence that the bursts are due to a microbunching instability driven by the emission of synchrotron radiation in the bunch. Ob...

However, John Rees has pointed out that the above reference is incorrect. The dynamic p was realized a few years later, and the correct references are: 15. F. Amman, R. Andreani, M. Bassetti, M. Bernardini, A. Cattoni, R. Cerchia, V. Chimenti, G. Corazza, E. Ferlenghi, L. Mango, A. Massarotti, C. Pellegrini, M. Placidi, M. Puglisi, G. Renzler, F. Tazzioli, International Conference on High Energ...

This paper describes the design, fabrication, and record performance of a new class ultra-wideband wavelength tuning, ultra-low noise semiconductor laser, Integrated Coherent Tunable Laser (ICTL). The ICTL device is designed for, fabricated in, CMOS foundry based Silicon Photonics platform, utilizing heterogeneous integration III-V material to create integrated gain section laser–enablin...

the concept of fuzzy soft γ-ring is introduced; and some properties of fuzzy soft γ-rings are given. then the definitions of fuzzy soft γ-ideals are proposed and some of their theories are considered.

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Consider a ring K, a topological space X and a sheaf A on X of K[[~]]-algebras. Assuming A ~-adically complete and without ~torsion, we first show how to deduce a coherency theorem for complexes of A -modules from the corresponding property for complexes of A /~A -modules. We apply this result to prove that, under a natural properness condition, the convolution of two coherent kernels over defo...

It was successfully demonstrated at UVSOR-II that, by using an external laser source, various micro-density structures such as a femtosecond dip or periodic modulation could be created on an electron bunch circulating in a storage ring. The bunch with femtosecond dip emitted broadband coherent synchrotron radiation. That with periodic density modulation emitted coherent and monochromatic terahe...

Consider a ring K, a topological space X and a sheaf A on X of K[[~]]-algebras. Assuming that A is ~-complete and without ~torsion, we first show how to deduce a coherency theorem for complexes of A -modules from a corresponding property for complexes of A /~A -modules. We apply this result to prove that, under a natural properness condition, the convolution of two coherent kernels over deforma...

In this work we study a kind of coherence condition on FIGmodules, which generalizes the usual notion of finite generation. We prove that a module is coherent, in the appropriate sense, if and only if its generators, as well as its torsion, appears in only finitely many degrees. Using this technical result, we prove that the category of coherent FIG-modules is abelian, independent of any assump...